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[B52]

FWIW, I'm about 150 miles post crank-sensor replacement and still haven't relaxed.

Well, I need the dead B52 currently sat at EGVA, and it's about a 150 mile round trip :-)

https://youtu.be/h5gAufVQEWM

One of these?

[LC0112G]

Yup. Diverted in last week with an engine failure. Very tricky landing with only 7 of the 8 engines running on one of the longest runways in the UK 

Likely to be there for a few weeks, till Santa brings it a new engine for Xmas.

[Shackeng]

I flew with an old timer years ago. One of his aphorisms was “When the Engineer tells me we’ve lost  number 4, my reply should be “Which side?” 

[B52]

Or in the case of the B-36, six turning and four burning:

https://youtu.be/sM1CZdppWrU

(Sometimes two turning, two burning, two smoking, two choking, and two more unaccounted for).

Sorry to derail the thread with aviation nonsense - how is the crank sensor?

[Doctor Gollum]

There's a plane that doesn't want to leave the ground if ever there was

[ronnyd]

They call it The Peacemaker, how apt.

[LC0112G]

Spoke too soon. Conked out again on leaving Tescos petrol station this morning. Eventually got it restarted (right foot on throttle, left on brake to keep the revs up), did the weekly shop and then got home. Just about to go out on a 1 hour 'test drive' - amongst other things to go fetch my Tech 1.

If it plays up again this afternoon I'll unplug the MAF to see what that does. DIS pack was replaced about 3 years ago, so shouldn't be that. Beginning to think it's electrical in nature - alternator, battery or wiring sort of thing. Rain Water in some connectors somewhere perhaps.

[cam.in.head]

does it play up whilst driving or with any throttle whatsoever or just stall when you have no throttle.
likewise if you just give it the tiniest of throttle whilst starting does it fire up immediately and run good.

[LC0112G]

I've found A fault, but don't know yet if it's THE fault. Haven't got enough time today to go looking further, and haven't got a spare of the part required anyway so until I get time for a bodge fix I'll leave you all guessing as to the cause  I'll try and get some photos tomorrow, and do a bodge fix.

does it play up whilst driving or with any throttle whatsoever or just stall when you have no throttle.
likewise if you just give it the tiniest of throttle whilst starting does it fire up immediately and run good.

It does (and has this afternoon several times) stalled whilst moving with the throttle closed. If you're going more than about 30MPH (for instance coasting down hill at 60MPH) then some throttle is enough to get it re-started again whilst moving. Below 20MPH then you can't get it to restart whilst still moving. I'm assuming that below 20MPH there isn't enough drag back through the TQ to turn the engine over to restart it.

It has started from cold every time so far. It starts to play up after perhaps 20 minutes once properly up to temperature. Once it's started stalling and you're stationary and in Park/Neutral it needs quite a lot of throttle (perhaps 30-50%) to get it to restart. Once restarted it'll stall again unless you keep above 1000RPM at idle. The amount of throttle to keep it running is variable whilst stationary - you just need to keep RPM >1000. Sometimes it will idle OK, if a little roughly, other times not. Once moving it doesn't seem to stall if you've got any throttle on.

Tech 1 is showing CTS and TPS working OK. MAF was showing 11kg/whatever at tickover. Only trouble code was TC19 whilst engine not running, which I think is just no crank sensor signal, which is fair enough whilst not running. Crank and Hall sensors show Ok with engine running.

[Doctor Gollum]

Which coolant temp sensor?

[Nick W]

Sounds even more like the MAF than it did when you started this post.
It's doing exactly what mine did.
Once the problem starts, disconnect  the MAF and see if it runs any better. Ignore the EML, it will go out when you reconnect the sensor.

[LC0112G]

Which coolant temp sensor?

Tech 1 only reads the ECU engine CTS. That's ok - if a little hot in the 85-92 range. Suspect it's running hoter than normal because I'm keeping the revs up, and Bambi does appear to have done for my Aircon, so the A/C fan isn't running. Main fans cut in correctly though just over 90.

Dash CTS agrees with the Tech 1 reading from t'other sensor.

[LC0112G]

Sounds even more like the MAF than it did when you started this post.
It's doing exactly what mine did.
Once the problem starts, disconnect  the MAF and see if it runs any better. Ignore the EML, it will go out when you reconnect the sensor.

The fault I've found isn't MAF, but is air related. Photos tomorrow.

[B52]

I'm curious how this turns out, KW02 being a lady of a certain age.

[Doctor Gollum]

If that's Kevin's old bus, you've not much to worry about